I have a com hydraulic custom roller cam from comp. 528in 547exh. duration at .50 248in and 254 exh. lsa 110. right now i have c heads with pro magnum 1.6 ratio full roller rockers. I want to switch to 1.7 to get more lift. The springs im currently using are comp dual 1.437" valve springs. part number 995-16. With a 1.7 ratio will i have issues with coil bind?

 

i know the coil bind of the spring is 1.020. does that help?

 

You should use the recommend springs that are paired with that camshaft.
Once you know what spring to use, you then measure pocket to retainer height with an installed height micrometer. Shim pockets to correct installed height. If pockets are too shallow, you can machine them down. How much you can machine before you hit water.... I have no idea

 

I have the springs that came with the camshaft but i want to switch rocker arm ratio. I dont know if the springs will work because with the 1.7 ratio rockers my lift will go from the mid 500's to around 580 lift.

 

You'll have to see what your installed height is then subtract the total lift from that and make sure you have at least .060-.080 over the end result;
i.e. 1.700 installed height - .550 lift leaves you with 1.150. If your springs coil bind at 1.020 then you have .130 before bind, add .060-.080 to that and you'll be safe up to about .600+ lift.

 

Hey; Remember when you add lift you also decrease piston to valve clearance, if you do not know your current clearance, you might want to investigate further. Happy motoring